This gas is not a constituent of air.

hydrogen

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oxygen

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carbon dioxide

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nitrogen

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Solution

The correct option is A
hydrogen

The explanation of the correct answer - (A) Hydrogen
Composition of air -
Nitrogen - 78%
Oxygen - 21%
carbon dioxide - 0.04%
Noble gases - 0.9%
Water vapours - variable
Dust particles - variable
The explanation for the incorrect answer -
(B) oxygen, (C) carbon dioxide, (D) nitrogen - These gases are the major components of air.
Hence, option (A) is correct. Hydrogen is not the constituent of air.

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